TY  - CONF
AU  - Tomás, R.
AU  - Cardona, J.F.
AU  - Carlier, F.S.
AU  - Coello de Portugal, J.M.
AU  - Dilly, J.
AU  - Esperante Pereira, D.
AU  - Fol, E.
AU  - Fuster, J.
AU  - Garcia-Tabares, A.
AU  - Gonzalez-Iglesias, D.
AU  - Hoekstra, R.
AU  - Hofer, M.
AU  - Maclean, E.H.
AU  - Malina, L.
AU  - Persson, T.H.B.
AU  - Rodriguez, Y.
AU  - Skowroński, P.K.
AU  - Spitznagel, M.L.
AU  - Wegscheider, A.
AU  - Wenninger, J.
ED  - Boland, Mark
ED  - Tanaka, Hitoshi
ED  - Button, David
ED  - Dowd, Rohan
ED  - Schaa, Volker RW
ED  - Tan, Eugene
TI  - LHC Optics Measurement and Correction Software Progress and Plans
J2  - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY  - Melbourne, Australia
T2  - International Particle Accelerator Conference
T3  - 10
LA  - english
AB  - LHC Optics Measurements and Corrections (OMC) require efficient on-line software applications to acquire and analyze data and to compute the necessary corrections. During Run 2 various measurement and correction techniques have been merged to yield unprecedented optics quality, increasing the required number of steps to finalize the optics commissioning and the size of the software project. In turn, this calls for a higher level of automation, where machine learning techniques are being implemented. During the Long Shutdown 2 a large refactoring of the codes will be in place to improve performance, maintainability and extensibility. A description of the current status of the software and future plans is given.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 2773
EP  - 2776
KW  - optics
KW  - software
KW  - coupling
KW  - MMI
KW  - GUI
DA  - 2019/06
PY  - 2019
SN  - 978-3-95450-208-0
DO  - DOI: 10.18429/JACoW-IPAC2019-WEPGW116
UR  - http://jacow.org/ipac2019/papers/wepgw116.pdf
ER  - 

TY  - CONF
AU  - Banon-Caballero, D.
AU  - Catalán Lasheras, N.
AU  - Faus-Golfe, A.
AU  - Gimeno, B.
AU  - Szypula, K.T.
AU  - Wuensch, W.
ED  - Boland, Mark
ED  - Tanaka, Hitoshi
ED  - Button, David
ED  - Dowd, Rohan
ED  - Schaa, Volker RW
ED  - Tan, Eugene
TI  - Combined Field Emission and Multipactor Simulation in High Gradient RF Accelerating Structures
J2  - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY  - Melbourne, Australia
T2  - International Particle Accelerator Conference
T3  - 10
LA  - english
AB  - Field emitted electrons have important consequences in the operation of high-gradient RF accelerating structures both by generating so-called dark currents and initiating RF breakdown. The latter is an important limitation of the performance in such devices. Another kind of vacuum discharge that primarily affects the operation of lower-field RF components, for example those used in space applications, is multipactor. Theoretical simulations using CST Particle Studio, show that field emitted electrons generated in the high field regions of high-gradient accelerating cavities migrate to low field regions under ponderomotive forces potentially triggering multipactor there. This phenomenon is an interplay between high field and low field processes which may have as a consequence that multipactor actually affects to the performance of high-gradient cavities because field emitted electrons might reduce the timescales for the onset of multipactor.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 2940
EP  - 2943
KW  - electron
KW  - multipactoring
KW  - simulation
KW  - cavity
KW  - GUI
DA  - 2019/06
PY  - 2019
SN  - 978-3-95450-208-0
DO  - DOI: 10.18429/JACoW-IPAC2019-WEPRB058
UR  - http://jacow.org/ipac2019/papers/weprb058.pdf
ER  - 

TY  - CONF
AU  - Banon-Caballero, D.
AU  - Boronat, M.
AU  - Catalán Lasheras, N.
AU  - Faus-Golfe, A.
AU  - Gimeno, B.
AU  - Lucas, T.G.
AU  - Millar, W.L.
AU  - Paszkiewicz, J.
AU  - Pitman, S.
AU  - Sánchez Sebastián, V.
AU  - Vnuchenko, A.
AU  - Volpi, M.
AU  - Widorski, M.
AU  - Wuensch, W.
AU  - del Pozo Romano, V.
ED  - Boland, Mark
ED  - Tanaka, Hitoshi
ED  - Button, David
ED  - Dowd, Rohan
ED  - Schaa, Volker RW
ED  - Tan, Eugene
TI  - Dark Current Analysis at CERN’s X-band Facility
J2  - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY  - Melbourne, Australia
T2  - International Particle Accelerator Conference
T3  - 10
LA  - english
AB  - Dark current is particularly relevant during operation in high-gradient linear accelerators. Resulting from the capture of field emitted electrons, dark current produces additional radiation that needs to be accounted for in experiments. In this paper, an analysis of dark current is presented for four accelerating structures that were tested and conditioned in CERN’s X-band test facility for CLIC. The dependence on power, and therefore on accelerating gradient, of the dark current signals is presented. The Fowler-Nordheim equation for field emission seems to be in accordance with the experimental data. Moreover, the analysis shows that the current intensity decreases as a function of time due to conditioning, but discrete jumps in the dark current signals are present, probably caused by breakdown events that change the emitters’ location and intensity.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 2944
EP  - 2947
KW  - radiation
KW  - operation
KW  - electron
KW  - ECR
KW  - linac
DA  - 2019/06
PY  - 2019
SN  - 978-3-95450-208-0
DO  - DOI: 10.18429/JACoW-IPAC2019-WEPRB059
UR  - http://jacow.org/ipac2019/papers/weprb059.pdf
ER  - 

TY  - CONF
AU  - Manczak, J.
AU  - Neuffer, D.V.
AU  - Stratakis, D.
ED  - Boland, Mark
ED  - Tanaka, Hitoshi
ED  - Button, David
ED  - Dowd, Rohan
ED  - Schaa, Volker RW
ED  - Tan, Eugene
TI  - Passive Absorbers for Maximizing the Performance of the Mu2e-II Experiment
J2  - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY  - Melbourne, Australia
T2  - International Particle Accelerator Conference
T3  - 10
LA  - english
AB  - The Fermilab’s Mu2e experiment is designed to search for Charged Lepton Flavour Violation in direct, neutrinoless conversion of muon into electron in the presence of a nucleus’ electromagnetic field. Quantity, which is going to be observed is the ratio between the rate of the above BSM (Beyond Standard Model) reaction and the rate of the standard muon capture on the nucleus. The measurement precision is expected to reach up to 10⁻¹⁷. Mu2e-II is the codename for the second phase of the experiment planned to run with the lower energy, higher intensity primary proton beam provided by PIP-II accelerator, currently under construction. The ionization cooling with a wedge absorber is introduced to Mu2e-II setup for potential increase in the number of low momentum muons reaching the target. The study is made into the position and size of the wedge inside the beamline using G4Beamline simulation framework. Results show an increase up to 12% for muons with momentum P below 30 MeV/c and 7% for muons with P<40 MeV/c when the beam is measured right after the wedge. Further studies are necessary to investigate how this gain can be delivered to the stopping target.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 3345
EP  - 3348
KW  - target
KW  - experiment
KW  - solenoid
KW  - proton
KW  - collimation
DA  - 2019/06
PY  - 2019
SN  - 978-3-95450-208-0
DO  - DOI: 10.18429/JACoW-IPAC2019-WEPTS099
UR  - http://jacow.org/ipac2019/papers/wepts099.pdf
ER  -